Negative deviation issue of storage tank steel plates
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A heavy oil storage tank is being designed, and when checking the wall thickness, this old-fashioned problem came up: is the negative deviation of today’s carbon steel plates, namely Q235-B plates, still the same as before? (Does it meet GB/T709-2006? ) Since corrosion protection is performed quite well these days, yet the operating conditions are becoming increasingly demanding, it is still necessary to take this into consideration when making calculations.
The wall thickness of steel plates and pipes usually has a negative deviation. Steel plates from different batches supplied by the same manufacturer also have varying wall thicknesses. However, upon rechecking in accordance with the relevant acceptance standards, it basically meets the requirements for product qualification.
So, what are those so-called relevant standards?